RESUMO
OBJECTIVE: To determine whether GnRH agonist administration induces changes in biochemical, hormonal and endometrial parameters in breastfeeding women. DESIGN AND PATIENTS: Starting at 6 weeks postpartum, fully breastfeeding mothers began treatment with GnRH agonist, receiving 300 micrograms and 600 micrograms per day by nasal spray for 6 months. A third group of breastfeeding women who were users of IUDs served as controls. Eighteen biochemical analyses were quantified in serum. Blood samples were collected at 0, 3 and 6 months after treatment and endometrial biopsies were obtained at 0 and 6 months. No other method of contraception was employed. RESULTS: Interindividual and intergroup differences were observed in clinical chemistry. According to the hormonal levels and the histopathologic analysis, various grades of follicular activity were found in the treated groups. No pregnancies occurred. CONCLUSION: Because GnRH agonist treatment had no significant deleterious effects on the parameters studied, this treatment could represent a feasible and safe approach to postpartum contraception.
